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4 January 2008 Focusing properties and focal depth of amplitude modulation Gaussian beams
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Abstract
The focusing properties and focal depth of amplitude modulation Gaussian beams are investigated. Numerical results show that the intensity in the focus plane is circle shape in the low numerical-aperture optical system, while the intensity distribution in the focal plane is ellipse shape in high numerical-aperture optical system due to contribution of depolarized longitudinal component. Focal spot size and focal depth can be adjusted by changing geometrical parameters and the modulation amplitude power n of Gaussian beams. The tunable range of the focal depth is very considerable.
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Jinsong Li, Songlin Zhuang, and Huizhen Feng "Focusing properties and focal depth of amplitude modulation Gaussian beams", Proc. SPIE 6832, Holography and Diffractive Optics III, 68322F (4 January 2008); https://doi.org/10.1117/12.757218
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